On a Core boot after the Kubuntu splash screen what normally happens is that you'll see the kinit: No resume image, doing normal boot...
followed by Orbiter Generation Start and when completed you'll see Orbiter Generation Done (- except probably in your case).
Then X windows starts.
When MCE tries to switch to the X window do a <CTRL/F1) to get the console 1 window (dcerouter login).
Are you stuck at Orbiter Generation Start and nothing afterwards or are you getting any error messages?
Another thing to look at would possibly be your xorg.conf.